Sprocket-wheel.



No. 807,363. PATBNTED DEC. 12, 1905- J. M. DODGE,

SPROUKET WHEEL.

APPL IGATibN FILED JUNE 1,1904.

UNITED STATES PATENT OFFIOE.

JAMES M. DODGE, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE LINK BELTENGINEERING COMPANY, OF PHILADELPHIA, PENNSYL- VANIA, A CORPORATION OFPENNSYLVANIA.

SPROCKET-WHEEL.

Specification of Letters Patent.

Patented Dec. 12, 1905.

Application filed 1 16 1,1904. Serial No. 210,666.

To all whom it may concern.-

Be it known that I, JAMES M. DODGE, acitizen of the United States,residing in Philadelphia, Pennsylvania, have invented certainImprovements in Sprocket-Wheels, of which the following is aspecification.

The main object of my invention is to provide a sprocket-wheel with anantifrictionhearing at the point where the ends of the links of thechain bear upon the wheel.

A further object of the invention is to provide means for adjusting thisbearing-point so as to keep the pitch-line of the chain the same.

My invention is especially applicable to sprocket-wheels in which theteeth engage the links of a chain midway between the pivots thereof.

In the accompanying drawings, Figure 1 is a side View, partly insection, of sufficient of a sprocket-wheel to illustrate my invention,showing the chain in position. Fig. 2 is a plan View of the wheel. Fig.3 is a sectional view on the line 3 3, Fig. 2. Fig. 4 is a view of asprocket-wheel having a roller and means for adjusting the same. Fig. 5is a sectional View on the line 5 5, Fig. 4; and Fig. 6 is a Viewshowing the adjusting means, the roller beingomitted.

A is a sprocket-wheel having teeth a, which contact with the wheels 6 ofthe chain B. These wheels 6 are mounted on pins 6, extending from oneelement of the link of the chain to the other, as clearly shown inFig. 1. The links of the chain articulate upon pins 0, and the wheelsI), in the present instance, are mounted on the links midway between thepivots. In order to provide a bearing with the least friction possiblefor the links at the pivot-point, I mount in recesses a of thesprocket-wheel rollers (Z, carried by spindles d, and these rollers areso situated that the ends of the links will rest upon them, thus keepingthe chain in perfect alinement. In

some instances the rollers may be formed as Shown in Figs. 4 and 5,which illustrate the rollers 0Z mounted on eccentrics D, carried byshafts D, which can be turned and locked in any position desired. Bythis means the chain can be kept at the proper pitch-line. In someinstances, as shown in Fig. 6, the rollers may be dispensed with and theeccentrics D used to support the chain at the proper point.

I claim as my invention 1. The combination of a chain consisting of aseries of links connected together by pivotpins, with a sprocket-wheelhaving teeth arranged to engage the chain and having rollers mountedbetween the teeth and so situated that they will bear upon the chain inline'with the pivots, substantially as and for the purpose set forth. 7

2. The combination of a chain made up of a series of links, a rollermounted on each link midway between the ends thereof, with asprocket-wheel having teeth arranged to engage the rollers of the chain,and having rollers for supporting the chain at the pivotpoints,substantially as and for the purpose set forth.

3. A sprocket-wheel having teeth, and rollers mounted on thesprocket-wheel between the teeth, and means for adjusting the rollers,substantially as described.

- 4. The combination ofasprocket-wheelhaving teeth, rollers mountedbetween the teeth and eccentrics upon which the rollers are mounted,said eccentrics being adjustable, substantially as described.

5. The combination of a sprocket-wheel having teeth, with eccentricsmounted between the teeth acting as supports for a chain, means foradjusting the eccentrics and locking them in the adjusted position.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

JAMES M. DODGE.

